OA switchboard (1910 to 1928) Previous
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The OA switchboard meter was a back-connected version of the standard singlephase or polyphase OA meter. Disconnect and bypass links were provided within the meter for testing.
 
OA polyphase switchboard
Westinghouse Handbook on Watthour Meters		 OA switchboard
Westinghouse Handbook on Watthour Meters